Overview

• Ukraine’s energy ministry said a strike on a Slavutych substation cut external power to Chernobyl’s protective sarcophagus, with supply later restored and radiation readings reported as normal by Minister Switlana Hryntschuk.
• The IAEA reported the Chernobyl sarcophagus temporarily relied on two diesel generators, while the site’s three decommissioned reactors were switched to an alternate line.
• Zaporizhzhia has had no external power since September 23, with cooling maintained by diesel generators and fuel on site estimated at roughly ten days, which the agency calls the longest such outage of the war.
• IAEA chief Rafael Grossi said conditions at Zaporizhzhia are stable for now but not acceptable for nuclear safety, as plant management reported regular fuel deliveries and President Volodymyr Zelenskyy cited a generator malfunction.
• Attribution is contested: Zelenskyy accused Russia of a deliberate multi‑drone attack affecting Chernobyl, while Greenpeace said satellite analysis suggests Zaporizhzhia’s severed high‑voltage line shows no obvious shelling and alleged possible sabotage.